package cn.xunjie.basic.util;

import cn.afterturn.easypoi.excel.ExcelExportUtil;
import cn.afterturn.easypoi.excel.ExcelImportUtil;
import cn.afterturn.easypoi.excel.entity.ExportParams;
import cn.afterturn.easypoi.excel.entity.ImportParams;
import cn.afterturn.easypoi.excel.entity.enmus.ExcelType;
import org.apache.commons.lang3.StringUtils;
import org.apache.poi.ss.usermodel.Workbook;
import org.springframework.web.multipart.MultipartFile;

import javax.servlet.http.HttpServletResponse;
import java.io.File;
import java.io.IOException;
import java.net.URLEncoder;
import java.util.List;
import java.util.Map;
import java.util.NoSuchElementException;
public class ExcelUtil {

    /**
     * Excel导入导出工具类
     * @author hm
     */


        /**
         * 导出工具类
         * @param list
         * @param title
         * @param sheetName
         * @param pojoClass
         * @param fileName
         * @param isCreateHeader
         * @param response
         */
        public static void exportExcel(List<?> list, String title, String sheetName, Class<?> pojoClass,
                                       String fileName, boolean isCreateHeader, HttpServletResponse response){
            ExportParams exportParams = new ExportParams(title, sheetName);
            exportParams.setCreateHeadRows(isCreateHeader);
            defaultExport(list, pojoClass, fileName, response, exportParams);
        }

        /**
         * 导出工具类
         * @param list
         * @param title
         * @param sheetName
         * @param pojoClass
         * @param fileName
         * @param response
         */
        public static void exportExcel(List<?> list, String title, String sheetName, Class<?> pojoClass,String fileName,
                                       HttpServletResponse response){
            defaultExport(list, pojoClass, fileName, response, new ExportParams(title, sheetName));
        }

        public static void exportExcel(List<Map<String, Object>> list, String fileName, HttpServletResponse response){
            defaultExport(list, fileName, response);
        }

        private static void defaultExport(List<?> list, Class<?> pojoClass, String fileName,
                                          HttpServletResponse response, ExportParams exportParams) {
            Workbook workbook = ExcelExportUtil.exportExcel(exportParams,pojoClass,list);
            if (workbook != null); downLoadExcel(fileName, response, workbook);
        }

        private static void downLoadExcel(String fileName, HttpServletResponse response, Workbook workbook) {
            try {
                response.setCharacterEncoding("UTF-8");
                response.setHeader("content-Type", "application/vnd.ms-excel");
                response.setHeader("Content-Disposition", "attachment;filename=" + URLEncoder.encode(fileName, "UTF-8"));
                workbook.write(response.getOutputStream());
            } catch (IOException e) {
                //throw new NormalException(e.getMessage());
            }
        }

        private static void defaultExport(List<Map<String, Object>> list, String fileName, HttpServletResponse response) {
            Workbook workbook = ExcelExportUtil.exportExcel(list, ExcelType.HSSF);
            if (workbook != null);
            downLoadExcel(fileName, response, workbook);
        }

        public static <T> List<T> importExcel(String filePath,Integer titleRows,Integer headerRows, Class<T> pojoClass){
            if (StringUtils.isBlank(filePath)){
                return null;
            }
            ImportParams params = new ImportParams();
            params.setTitleRows(titleRows);
            params.setHeadRows(headerRows);
            List<T> list = null;
            try {
                list = ExcelImportUtil.importExcel(new File(filePath), pojoClass, params);
            }catch (NoSuchElementException e){
                //throw new NormalException("模板不能为空");
            } catch (Exception e) {
                e.printStackTrace();
                //throw new NormalException(e.getMessage());
            } return list;
        }

        public static <T> List<T> importExcel(MultipartFile file, Integer titleRows, Integer headerRows, Class<T> pojoClass){
            if (file == null){ return null;
            }
            ImportParams params = new ImportParams();
            params.setTitleRows(titleRows);
            params.setHeadRows(headerRows);
            List<T> list = null;
            try {
                list = ExcelImportUtil.importExcel(file.getInputStream(), pojoClass, params);
            }catch (NoSuchElementException e){
                // throw new NormalException("excel文件不能为空");
            } catch (Exception e) {
                //throw new NormalException(e.getMessage());
                System.out.println(e.getMessage());
            }
            return list;
        }

    }

